<!-- HEXAGONAL P6 SPACE GROUPS -->
<input type="checkbox" name="spacegroups[]" id="sg_P6" value="P6"> P6<br/>
<input type="checkbox" name="spacegroups[]" id="sg_P61" value="P61"> P61<br/>
<input type="checkbox" name="spacegroups[]" id="sg_P62" value="P62"> P62<br/>
<input type="checkbox" name="spacegroups[]" id="sg_P63" value="P63"> P63<br/>
<input type="checkbox" name="spacegroups[]" id="sg_P64" value="P64"> P64<br/>
<input type="checkbox" name="spacegroups[]" id="sg_P65" value="P65"> P65<br/>
